Hubble Makes First Measurements of Earth-Sized Exoplanet Atmospheres

  • Released Wednesday, July 20, 2016

On May 4th, 2016, the Hubble Space Telescope made the first spectroscopic measurements of two of the three known Earth-sized exoplanets in the TRAPPIST-1 system just 40 light-years away. Now the results are in: a thick, puffy, hydrogen-helium atmosphere is likely ruled out from the possible range of atmospheres for these two planets.

Additional visuals from the European Southern Observatory can be downloaded here:

Animation - Artist concept of the double-transit Hubble observed on May 4, 2016, when planets TRAPPIST-1b and TRAPPIST-1c passed across the disk of their host star just minutes apart.

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NASA's Goddard Space Flight Center

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This page was originally published on Wednesday, July 20, 2016.
This page was last updated on Wednesday, May 3, 2023 at 1:48 PM EDT.


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